19. Which compound would show major fragment ions at m/z 73 and 59? (A) OH CH3CH2CHCH2CH3 OH (B) CH3CH2CH2CHCH3 OH (C) CH3CHCHCH3 CH3 (D) OH CH3CCH2CH3 CH3
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- In 1H and 13C NMR spectra, how many signals does the unsaturated ketone (CH3)2CHCH2C (O)CH=CH2 have? Choices: 6H-6C, 5H-6C, 5H-7C, 6H-7CHN 1. a) Assign R/S to all stereogenic centers and circle all diastereotopic protons b) Draw the ¹H NMR spectrum of the depicted compound c) How many signals will appear in the 13C NMR spectrumWhich compound gives a molecular ion at m/z = 122: C6H5CH2CH2CH3, C6H5COCH2CH3, or C6H5OCH2CH3?
- Which of the diethylbenzene isomers (ortho, meta, or para) corresponds to each set of 13C NMR spectral data?[A] 13C NMR signals: 16, 29, 125, 127.5, 128.4, and 144 ppm[B] 13C NMR signals: 15, 26, 126, 128, and 142 ppm[C] 13C NMR signals: 16, 29, 128, and 141 ppm15) What compound is produced when N,N-dimethylpropanamide (shown below) is treated with LiAlH4? A) CH3CH2CONH2 B) CH3CH2CH2NH2 C) CH3CH2CH2OH D) CH3CH2CH2N(CH3)2 E) CH3CH2N(CH3)2Choose the reagent(s) that will accomplish the following transformation: - OH Na2Cr₂O7, H₂SO4 1) CH3MgBr (2 eq), 2) H3O+ 1) LIAIH4, 2) H3O+, 3) CH3MgBr (2 eq), 4) H3O+ 1) LIAIH4, 2) H3O+ 1) TSCI, 2) NaOH
- Provide a structure that is consistent with the data: molecular formula C6H10. 1H NMR: 2.0 ppm (1H, septet), 1.8 ppm (3H, singlet), 0.9 ppm (6H, doublet) A) B) C) D) E) "i CH3CH2C=CH -CC-CH₂ O A OB OC OD OE CH₂iii) ) Calculate and show the unsaturation number for the molecule of periplanone shown below: H igO Periplanone siboanotni outoude on Unsaturation = Нur wolad mworla opemo sng BWOTE gaiau etonioola 11111) How many sterogenic centers are there in periplanone? CH2Which of the following species has a characteristic absorption at 2200 cm-1 in its IR spectrum? OPHCH₂CN PhCH2CO2CH3 O PHCH2N(CH3)2 O PHCH₂OCH3 PhCH2CH2OH
- 24. The 1HNMR spectrum of an unknown acid has the following peaks: 12.71 ppm (1H, S); 8.04 ppm (2H, d); 7.30 ppm (2H, d); 2.41 ppm (3H, s) Which structure best fits this spectral information? Dlan OH A B علی مود C OH D OHNoneCompound B: C,H¿Br, Draw compound B. ΙΗ ΝMR Select Draw Rings More 6 H C Br 2 H (CH3)4Si 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 300-MHz 'H NMR spectrum ppm (8)